Machine for cupping sapphires and other precious stones.



J. L. WBNNSTROM. 0mm surnmzs AND OTHER PR AIPLIOATIOK FILED FEB. 27, 1909. J

Patented Dec. 7, 1909.

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WITNESSES INVENTOR MM w w ATTORNEY \w I. L. wmmsmom. MACHINE FOR OUPPING SAPPHIRES AND OTHER PRECIOUS STONES. APPLIOATION FILED FEB. 2'1, 1909.

Patented Dec. 7, 1909.

Masses 222 h n4 j) v v Z/f fiwmmm J. L. WBNNSTROM. MACHINE FOR GUPPING SAPPHIRES AND OTHER PRECIOUS STONES.

APPLICATION FILED FEB. 2'7, 1909.

' Patented Dec.7, 1909.

' 3 SHEETS-SHEET 3 INVEN OR WW JOHN LOUIS W'ENNSTRQM, OF SUFFERN, NEW YORK, ASSIGNOR TO AMERICAN GEM MININQ SYNDICATE OF ST. LOUIS, MISSOURI, .h. CORPORATION (3F MONTANA.

MACHINE FOE CUPPING SAPPHIBES AND STEEL! PRECIOUS STONES.

Specification of Letters I'Fatent.

Application filed February 27, 1909. Serial No. 480,336.

, Machine for Cu 33in So i hires and other i f! i construct a machine for this purpose BS to Precious Stones, of which the following is n specification. My invention relates to n'iuchincs for grinding out concuvitics' in sapphires, dim i monds and other precious stones to adopt them to be used bearings for the spindles of armaturcs in electric motors and the like. The main object of my invention to so increase the speed of production.

In machines as heretofore made for cupping diamonds, the chuck holding the stone to be cupped has been held in n lixcd position rotarily' against a revolving convex grinding wheel, and then it it was found that the position of the stone, owing to its grain, did not give-satisfactory results, the grinding would he stopped end the diamond fixed in another position and so on until by such experimentation, the best position for work on that particular diamond was found. To avoid this tedious trying of different positions to strike the grain of the stone ing cupped, I rnountthc diamond holding chuck spindle in bearings and provide it ulley by which constant rotary motion may e imparted to it, While constant rotary motion is at the some time imparted to the spindle carrying the grinding hull and lying in a line at right angles or nearly so to the chuck spindle. By this means the grain of the stone being cupped continuously changing its position with relation to the direction of rotation of the grinding hull. To further increase the speed of production I provide two diamond holdii'ig' chucks on op posite sides of the grinding hull :nnlnicuns to press them up equally against opposite sides of the revolving grinding hull,

In the uccon'ipmiying drawings Figure. l is a plan. view of :1 machine embodying my improvements; Fi 3 :1 view of the grinding head and (.linn'iond holding chucis ,drnwn to a larger scale; Fig. 3 a front elevation; Fig. -iis u plzin vicu ol it inodificntion drawn to n smaller scale; l igg 5 is on end elevation.

Referring to Figs. 1 to 3, is the rotary l ijkontul slide Ways,

I caused to beer :igni

grinding" hull carried on the outcr end of a spindle a mounted in hearings in u head B, which is supported on u horizontal slidewny B on the fixed frame i ot the machine. The spindle a is provided with a belt pulley c by which it may he revolved. D l are the two diamond carrying studs in chucks C,

i t. on spindlcsC, t), which are mounted to turn in hearings in heads l). l). These spindles C, ore provided with belt pulleys .1, c, by which they may he revolved. The heads E, E are mounted upon hori- E E, on the frame l at right uncles to the slide il for the grinding hood, and on oi'iposite sides of the grind ing hull, that the two diamonds may he st op 'iosite dos of that he'll. This is eli'c 13d hy the two chuck hoods l5. clumped centrally in position on. the nod of the ironic oy a screw g. ()n the ends of the rod extending beyond the chuck heads are spiral springs ill between the said hoods and puts it ngl iustuhly mounted upon the threaded ends of the rod. G, so that these springs tend to push the heads townzl ouch other and the stones in the chucks against the grinding hull. To separate the heads l1), ill for the insertion or r moral of the. diamond studs into or from the chucks I provide a pair of lcrcrswil. K, hinged to the heads 1), it, and to each other giving a toggle action. When the grinding is in progress, those lovers are in the position shown in Fig. 3, but by liftii'ifl; the central joint, by n handle It" the hot-u may he separated; when the lcrcrs K, K are raised to carry the joint l" pustthc longitudinal lint passing through the centers zit which the lovers 2:: hinged to the heads E, E the pin it" on the lever l; will engug'c the notcn la in the lever it, so thut the heads will he kept spread apart, until the levers are lowered again. 3, J are handles by which the chucks 3, (I may he opened and closed.

In Figs. -l and 5, l have shown it modification, in which provision is made. for changing the position of, or osc llation the grinding head on it vertical or s coinciding with the center of the grinding hull. For this pin-pa instcnd oi mounliin; the grinding head if noon u s i rigidly fixed to or orinil 'ie id. as described noon it slide Way "i guide rod (2 .ln'itenteii Dec. 74".. room.

\ of the grinding ba vided' to allow pf proper 1 p 5, which is pivoted upon a vertically under the center ll. A. This slideway B is'supported upon a horizontal plate F Fig. 5, projecting from the frame of the machine and is held down upon the frame at its outer end by a gib f or other suitable means' A connecting rod It is pivoted to the outer end of the pivoted slideway 15 l for connection to a crank, eccentric or other suitable means, whereby oscillating motion may be imparted to the slideway and grinder head upon the vertical pivot 1?. Suitable adjusting means 71, 72 (Fig. 5) maybe proadjustment of the grinder head to insure an accurate proportioning of the grinding ball with relation to the two stdnes to be cupped. The pivot P may have slight vertical play in its bearing so as to allow of the requisite slight vertical movement of the parts for such fine adjustment.

I clXim as my invention- 1. machine for cupping other stones, comprising a rotary spindle carrying a grinding sliding heads carrying rotary chucks, and means l3, Figs. 4 and vertical pivot P,

sapphires or i frame and a ball, two spindles with to automatically press the stones, carried by the chucks simultaneously against opposite sides of the grinding ball. 2. A machine 'for cupping sapphires or other stones, comprising a rame an a I rotary spindle carrying a grindingfball with l rotary spindle two sliding heads carrying rotary spindles with chucks-adapted to hold the stones on opposite sides of the grinding ball, and spring means farn'ormally pressing the stones against the ball. 1

3. A machine for cupping sapphires or other stones, comprising a frame and a carrying a grinding ball with two sliding heads carrying rotary spindles with chucks to hold the stones on opposite sides of the grinding ball, spring means to press the heads toward each other and the stones against the grinding ball and means to separate the two heads against the pressure of the springs.

4. A machine for cupping sapphires or other stones, comprising a frame and a grinding head having a rotary spindle carrying a grinding ball with two sliding heads carrying rotary adapted to hold the stones on o of the. grinding ball, means or normally pressin the stones against the ball, and

means r oscillating the grinding head; on

spindles with chucks.

posite: sides an axis coinciding with the center 6f the grinding ball.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses. I

JOHN LOUIS WENNSTROM.

Witnesses:

WVALTER ABBE, L H. GROTE. 

